Creating an array

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Martin Racette - 17 Jan 2008 19:24 GMT

Hi,

I new to C#, and I would like to know how I can create an array that I do
not know in advance how many item will be placed there

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Thank You in Advance
Merci a l'avance

Martin

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Jeroen Mostert - 17 Jan 2008 19:31 GMT

> I new to C#, and I would like to know how I can create an array that I
> do not know in advance how many item will be placed there

Use ArrayList in .NET 1 or List<T> in .NET 2 (or any other more appropriate
collection). You can think of those as "growable arrays".

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Rene - 17 Jan 2008 19:50 GMT

Maybe this will help?

class Program
{
static void Main(string[] args)
{
// Get an array of ints.
int[] i = GetSomeIntArray<int>(123);

// Get an array of objects.
object[] o = GetSomeIntArray<object>(456);
}

private static T[] GetSomeIntArray<T>(int size)
{
return new T[size];
}
}

> Hi,
>
> I new to C#, and I would like to know how I can create an array that I do
> not know in advance how many item will be placed there

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Lasse Vågsæther Karlsen - 19 Jan 2008 13:27 GMT

> Maybe this will help?
>
[quoted text clipped - 14 lines]
> }
> }

This must surely be a solution to a different problem than what OP is
asking for?

1. it is named GetSome*Int*Array, whereas it will happily return an
array of any type, since its generic
2. you can easily replace the whole method with a subset of its
contents, ie:

int[] i = new int[123];
object[] o = new object[456];

What in particular was the point of this method?

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Lasse Vågsæther Karlsen
mailto:lasse@vkarlsen.no
http://presentationmode.blogspot.com/
PGP KeyID: 0xBCDEA2E3

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Rudy Velthuis - 17 Jan 2008 20:00 GMT

> Hi,
>
> I new to C#, and I would like to know how I can create an array that
> I do not know in advance how many item will be placed there

Say you have the number of items in numItems, and you want an array of
integers, then you can do:

int[] myArray = new int[numItems];

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Rudy Velthuis http://rvelthuis.de

"The secret of success is to know something nobody else knows."
-- Aristotle Onassis (1906-1975)

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Martin Racette - 18 Jan 2008 15:34 GMT

As I was saying I do not know how many items there will be in the array, so
I can not specify the size of it, because the size might be 0 and then again
it might be 1 000 000 000 000 items

So is it possble to create an array without defining its size

>> Hi,
>>
[quoted text clipped - 5 lines]
>
> int[] myArray = new int[numItems];

Signature

Thank You in Advance
Merci a l'avance

Martin

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Rudy Velthuis - 18 Jan 2008 16:06 GMT

> As I was saying I do not know how many items there will be in the
> array, so I can not specify the size of it, because the size might be
> 0 and then again it might be 1 000 000 000 000 items

Oh, you want it to be able to grow? Use a List<T> instead.

FWIW, you will probably have problems with 1 trillion items, no matter
what data type you choose. <g>

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Rudy Velthuis http://rvelthuis.de

"I think it would be a good idea."
-- Mahatma Gandhi (1869-1948), when asked what he thought of
Western civilization

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Martin Racette - 18 Jan 2008 17:18 GMT

Thanks, that was exactly what I was looking for

And the number was just an example <g>

>> As I was saying I do not know how many items there will be in the
>> array, so I can not specify the size of it, because the size might be
[quoted text clipped - 4 lines]
> FWIW, you will probably have problems with 1 trillion items, no matter
> what data type you choose. <g>

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Thank You in Advance
Merci a l'avance

Martin

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Willy Denoyette [MVP] - 18 Jan 2008 16:09 GMT

> As I was saying I do not know how many items there will be in the array,
> so I can not specify the size of it, because the size might be 0 and then
> again it might be 1 000 000 000 000 items
>
> So is it possble to create an array without defining its size

This was answered by others, use an ArrayList or Lis<T>, note that you won't
be able to store an array of 1 000 000 000 000 items ever, but I guess you
know that too.

Willy.

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Martin Racette - 18 Jan 2008 17:18 GMT

Thanks, that was exactly what I was looking for

And the number was just an example <g>

>> As I was saying I do not know how many items there will be in the array,
>> so I can not specify the size of it, because the size might be 0 and then
[quoted text clipped - 7 lines]
>
> Willy.

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Thank You in Advance
Merci a l'avance

Martin

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Creating an array

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